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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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Colligative Properties of Electrolytes
The colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one...
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Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...
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When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Ionic Compounds: Formulas and Nomenclature03:34

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An element composed of atoms that readily lose electrons (a metal) can react with an element composed of atoms that readily gain electrons (a nonmetal) to produce ions through complete electron transfer. The compound formed by this transfer is stabilized by the electrostatic attractions (ionic bonds) between the oppositely charged ions.
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Ionic Liquid-Based Electrolytes for Supercapacitor and Supercapattery.

Linpo Yu1, George Z Chen1,2

  • 1Department of Chemical and Environmental Engineering, Faculty of Science and Engineering, Key Laboratory of More Electric Aircraft Technology of Zhejiang Province, University of Nottingham Ningbo China, Ningbo, China.

Frontiers in Chemistry
|May 7, 2019
PubMed
Summary
This summary is machine-generated.

Ionic liquids (ILs) offer a safer alternative to conventional electrolytes in electrochemical energy storage (EES) devices. This review explores IL-based electrolytes for supercapacitors, supercapatteries, and micro-supercapacitors, highlighting their potential for high performance.

Keywords:
electrolytesinterfacesionic liquidsmicro-supercapacitorsupercapacitorsupercapattery

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Conventional electrolytes in energy storage devices have limitations like narrow potential windows, volatility, and flammability.
  • Ionic liquids (ILs) are emerging as promising alternatives due to their inherent stability and safety.
  • ILs offer potential for higher operating voltages and energy capacity in electrochemical energy storage (EES) devices.

Purpose of the Study:

  • To critically review recent literature on IL-based electrolytes for capacitive EES devices.
  • To explore the application of ILs in supercapacitors, supercapatteries, and micro-supercapacitors.
  • To provide insights into the future prospects of IL-based electrolytes in EES.

Main Methods:

  • Literature review of IL-based electrolytes in supercapacitors, supercapatteries, and micro-supercapacitors.
  • Analysis of ILs' advantages over conventional electrolytes.
  • Explanation of supercapattery fundamentals and micro-supercapacitor considerations.

Main Results:

  • ILs overcome limitations of aqueous and organic electrolytes, enabling higher operating voltages.
  • IL-based electrolytes show significant potential for supercapacitors, supercapatteries, and micro-supercapacitors.
  • Supercapatteries combine battery and supercapacitor merits, often exhibiting capacitive behavior.

Conclusions:

  • ILs are competitive electrolytes for advanced EES devices, offering enhanced safety and performance.
  • The review highlights the growing importance of ILs in supercapacitors, supercapatteries, and micro-supercapacitors.
  • Future research should focus on further optimizing IL-based electrolytes for next-generation capacitive EES.